Blog posts by Huaijin Hao

Huaijin Hao is a backend engineer at OpenObserve, focused on building scalable, high-performance distributed systems. He is passionate about cloud-native technologies and open source.

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OpenObserve vs ClickHouse: One Billion Log Records

Engineering

OpenObserve ClickHouse Benchmark

OpenObserve vs ClickHouse: One Billion Log Records

We generated one billion log records, 2 TiB of NDJSON, and wrote the identical bytes into ClickHouse and two OpenObserve instances at the same time, each on its own dedicated node. Across 19 queries with a full-text index on both sides, OpenObserve finished 3.4x to 4.6x faster on a third less disk. One compaction setting was worth more than the file format.

Hengfei Yang, Huaijin Hao

2026-08-22